//=========================================================================
// Copyright (C) 2024 The C++ Component Model(COMO) Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//=========================================================================

/**
 * Persist Memory allocator
 */

#include "pmfunction.h"
#include "pminternal.h"

void *pmalloc(void *md, size_t size)
{
    if (nullptr == md) {
        return nullptr;
    }

    struct mdesc *mdp = static_cast<struct mdesc *>(md);
    void *result = nullptr;

    if (0 == size) {
        return (nullptr);
    }

    if (! (mdp->flags & PMALLOC_INITIALIZED)) {
        if (! initialize(mdp)) {
            return (nullptr);
        }
    }

    if (size < sizeof(struct list)) {
        size = sizeof(struct list);
    }

    // todo : 这种写法的意义呢？
    if (0) {  // (BLOCKSIZE / 2) {
        result = allocate_blockfrag(mdp, size);
    }
    else {
        size_t blocks = BLOCKIFY(size);
        result = allocate_blocks(mdp, blocks);
    }

    return (result);
}
